What is the purpose of split sample verification in the testing process?

• A. To speed up testing.
• B. To determine specimen type.
• C. To confirm that the split secondary sample yields the same result as the primary sample.
• D. To check for adulteration.

Answer: (C)

Split sample verification checks that the secondary portion of a split urine sample yields the same result as the primary portion. This confirms the result is reliable and not affected by handling, labeling, or other small errors that could occur during collection or processing. The idea is to store the second portion for verification testing so that if there’s any question about the result, the same specimen can be re-tested without needing a new sample. If both portions agree, confidence in the result is strengthened; if they differ, it triggers investigation and possible re-testing. It’s about ensuring integrity and accuracy in the testing process, rather than speeding up testing, identifying specimen type, or directly detecting adulteration.